CN113064029A - High-voltage direct-current insulation monitoring system and monitoring method - Google Patents
High-voltage direct-current insulation monitoring system and monitoring method Download PDFInfo
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- CN113064029A CN113064029A CN202110284228.8A CN202110284228A CN113064029A CN 113064029 A CN113064029 A CN 113064029A CN 202110284228 A CN202110284228 A CN 202110284228A CN 113064029 A CN113064029 A CN 113064029A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
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Abstract
The invention discloses a high-voltage direct-current insulation monitoring system and a monitoring method, wherein the high-voltage direct-current insulation monitoring system comprises a control module, the control module is connected with a bus monitoring module and a branch monitoring module and respectively monitors insulation of a bus and a branch, and the monitoring method comprises the following steps: the bus monitoring module comprises a voltage measuring unit, a calculation and analysis unit and a monitoring bridge unit, wherein the calculation and analysis unit is used for calculating the voltage difference, the current value and the insulation resistance value between the positive electrode and the negative electrode of the bus and judging the insulation fault according to the change conditions of the voltage difference and the insulation resistance value; the branch monitoring module is connected with a branch unit and a communication unit and is used for monitoring the insulation condition of the branch unit and transmitting monitoring data through the communication unit. According to the invention, the insulation fault is preliminarily judged by the voltage measurement unit to realize the differentiation of the bus fault and the branch line fault, then the insulation state is respectively monitored by the bus monitoring module and the branch line monitoring module, and the voltage fluctuation to the ground is reduced by adopting the adjustment of a potentiometer instead of switching.
Description
Technical Field
The invention relates to the technical field of high-voltage direct-current insulation monitoring, in particular to a high-voltage direct-current insulation monitoring system and a monitoring method.
Background
The high-voltage direct-current power supply is a power supply which is input by alternating-current commercial power or three-phase power and output by direct-current voltage of more than thousands of volts or more than tens of thousands of volts, the output power is hundreds of watts to thousands of watts, and the high-voltage direct-current power supply can generally stabilize or stabilize the current. The prior direct-current high-voltage power supply boosts alternating-current commercial power or three-phase power from a power-frequency high-voltage transformer into alternating-current high-voltage power, and then obtains the direct-current high-voltage power through rectification and filtering. When high-voltage direct current is adopted for power supply, the positive pole and the negative pole of the bus are both in floating operation, namely the positive pole and the negative pole of the bus are not connected with a grounding wire, and equipment connected on the two poles of the bus or a branch circuit can influence the operation of the equipment or even be damaged due to insulation faults.
In the prior art, a direct current insulation monitoring device generally monitors the ground resistance of positive and negative poles of a bus in a mode of switching a balance bridge and an unbalanced bridge, but the ground voltage is easy to fluctuate in the switching process and only the insulation condition of the bus can be judged.
Disclosure of Invention
In order to solve the problems, the invention provides a high-voltage direct-current insulation monitoring system and a monitoring method, the insulation faults are preliminarily judged by a voltage measuring unit to realize the differentiation of the bus faults and the branch line faults, then the insulation states are respectively monitored by a bus monitoring module and a branch line monitoring module, and the voltage fluctuation to ground is reduced by adopting the adjustment of a potentiometer instead of switching.
The technical scheme adopted by the invention is as follows:
the application provides a high voltage direct current insulation monitoring system, including control module, control module includes the memory cell, control module is connected with bus monitoring module and branch line monitoring module and carries out insulation monitoring to bus and branch line respectively, wherein:
the bus monitoring module comprises a voltage measuring unit, a calculation and analysis unit and a monitoring bridge unit, wherein the voltage measuring unit is used for measuring real-time voltages of a bus anode and a bus cathode, the monitoring bridge unit is used for detecting an insulation resistance value between the bus anode and the bus cathode, the voltage measuring unit and the monitoring bridge unit are both connected with the calculation and analysis unit, the calculation and analysis unit is connected with a storage unit, the calculation and analysis unit is used for calculating a voltage difference, a current value and an insulation resistance value between the bus anode and the bus cathode, and judging an insulation fault according to the change conditions of the voltage difference and the insulation resistance value;
the branch line monitoring module is connected with a branch line unit and a communication unit, the branch line unit is connected with a bus positive electrode, a bus negative electrode and a grounding wire, the branch line unit comprises a rectifier, a storage battery, communication equipment and a bus insulating terminal, and the branch line monitoring module is used for monitoring the insulating condition of the branch line unit and transmitting monitoring data through the communication unit.
Preferentially, the monitoring bridge unit comprises a current measuring unit, a judging unit, a delay circuit, a bridge circuit and a potentiometer group, the current measuring unit is connected with a bus anode, a bus cathode and the judging unit, the current measuring unit is used for measuring real-time current of the bus anode and the bus cathode, the judging unit is connected with a delay circuit input end and a calculation and analysis unit, the delay circuit output end is connected with the bridge circuit, the delay circuit is used for prolonging the increasing or decreasing speed of the current, the bridge circuit is connected with the potentiometer group and a grounding wire, the bridge circuit is used for measuring the insulation resistance value of the bus anode to the ground or the bus cathode to the ground through a plurality of turn-off switches, and the potentiometer group is connected with a control module.
Preferably, the current measuring unit includes a positive ammeter and a negative ammeter, the positive ammeter has one end connected to the positive electrode of the bus and the other end connected to the determining unit, and the negative ammeter has one end connected to the negative electrode of the bus and the other end connected to the determining unit.
Preferably, the bridge circuit includes a first resistor, a second resistor, a first switch, and a second switch, and the potentiometer set includes a third potentiometer and a fourth potentiometer, wherein: first resistance, third potentiometre and first switch series connection, first resistance is kept away from first switch one end and is connected the delay circuit output, first switch is kept away from first resistance one end and is connected the earth connection, second resistance, fourth potentiometre and second switch series connection, second switch one end is kept away from to the second resistance and is connected the delay circuit output, the second switch is kept away from second resistance one end and is connected the earth connection.
Preferably, the resistance value of the first resistor is equal to the resistance value of the second resistor.
Preferentially, the voltage measurement unit comprises a positive voltage meter and a negative voltage meter, wherein one end of the positive voltage meter is connected with the positive pole of the bus, the other end of the positive voltage meter is connected with the grounding wire, one end of the negative voltage meter is connected with the negative pole of the bus, and the other end of the negative voltage meter is connected with the grounding wire.
Preferably, the branch line monitoring module includes a plurality of leakage current sensors, a plurality of GPS chips, a power amplifier, and an a/D conversion circuit, the leakage current sensor is disposed outside a connection line between each device and the bus in the branch line unit, the GPS chip is embedded in the leakage current sensor, the GPS chip is used to locate a device position where an insulation fault occurs, the leakage current sensor is connected to the power amplifier, the power amplifier is connected to the a/D conversion circuit, and the a/D conversion circuit is connected to the control module.
Preferably, a timer is arranged in the control module.
Based on the high-voltage direct-current insulation monitoring system, the application also provides a monitoring method using the high-voltage direct-current insulation monitoring system, and the monitoring method comprises the following steps:
s1, the control module respectively measures the voltage to ground of a bus anode and the voltage to ground of a bus cathode through a timer at equal intervals and controls a positive voltage meter and a negative voltage meter, and transmits the voltages to a calculation analysis unit;
s2, the calculation and analysis unit calculates the voltage difference between the voltage to ground of the positive electrode of the bus and the voltage to ground of the negative electrode of the bus, and the calculation and analysis unit records and draws the change curves of the voltage to ground of the positive electrode of the bus and the voltage to ground of the negative electrode of the bus;
s3, when the change curve is gentle, the control module conducts insulation fault troubleshooting on all devices of the branch line unit through the branch line monitoring module, the plurality of leakage current sensors conduct insulation fault detection on all the devices of the branch line unit at the same time, detection data are amplified through the power amplifier, then digital-to-analog conversion is conducted through the A/D conversion circuit, then the detection data are uploaded to the control module, and the branch line unit devices with insulation faults send position information through the GPS chip;
s4, detecting the grounding conditions of the positive pole and the negative pole of the bus through the bus monitoring module when the change curve is instantaneously steep, closing the first switch and the second switch, preliminarily judging the insulation fault type and determining the delay time of the delay circuit according to the measurement data and the interval time of the current measurement unit and the voltage measurement unit by the judgment unit, and reducing the delay time to the minimum value if the pressure difference is small and the current is small, wherein the insulation state is good at the moment; if the voltage difference transient state is too large, the current is increased, the delay time is increased, and at the moment, the bus is grounded in a single pole; if the voltage difference is smaller, the current difference is smaller but the current value is increased, and the bus bipolar is grounded at the moment; the control module controls the third potentiometer and the fourth potentiometer to be zero, the bridge circuit is a balanced bridge, and a first ratio of the voltage to ground of the positive pole of the bus to the voltage to ground of the negative pole of the bus is calculated; the control module increases the resistance of the third potentiometer, the resistance of the fourth potentiometer is still zero, the bridge circuit is an unbalanced bridge, a second ratio of the voltage to earth of the positive pole of the bus and the voltage to earth of the negative pole of the bus is calculated, the control module increases the resistance of the fourth potentiometer, the resistance of the third potentiometer is adjusted to be zero, a third ratio of the voltage to earth of the positive pole of the bus and the voltage to earth of the negative pole of the bus is calculated, the second ratio and the third ratio are combined to calculate the insulation resistance to earth of the positive pole of the bus and the insulation resistance to earth of the negative pole of the bus, and the calculated value is transmitted to the calculation and analysis unit to judge the grounding condition.
The invention has the beneficial effects that:
1. the bus monitoring module is combined with the branch monitoring module to carry out direct-current insulation monitoring, so that insulation fault judgment is accurate;
2. the insulation fault is preliminarily judged through the voltage measuring unit and the calculation and analysis unit, if the voltage to ground of the bus falls for a short time, the grounding of the bus is considered, and then the bus insulation monitoring is carried out through the monitoring bridge unit; if the voltage drop amplitude of the bus to the ground is slow, insulation faults of the branch line units are considered, insulation monitoring is carried out on a plurality of devices of the branch line units through leakage current sensors through the branch line monitoring module, and positioning is carried out through a GPS (global positioning system), so that the insulation faults can be solved quickly;
3. the monitoring bridge unit adopts the resistance value of the regulating potentiometer group to replace the switching of the switch, so that the fluctuation of the ground voltage of the bus caused by the switching of the switch is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the control module connections of the present invention;
FIG. 2 is a schematic diagram of the spur monitoring module connection of the present invention;
FIG. 3 is a schematic view of a bus monitoring module connection of the present invention.
Labeled as: 1. the intelligent monitoring system comprises a control module, 11, a storage unit, 2, a bus monitoring module, 21, a voltage measuring unit, 22, a calculation and analysis unit, 23, a monitoring bridge unit, 231, a current measuring unit, 232, a judging unit, 233, a delay circuit, 234, a bridge circuit, 235, a potentiometer bank, 3, a branch line monitoring module, 31, a branch line unit, 32, a communication unit, 33, a leakage current sensor, 34, a GPS chip, 35, a power amplifier and 36, and an A/D conversion circuit.
Detailed Description
As shown in fig. 1, the application provides a high voltage direct current insulation monitoring system, including control module 1, control module 1 includes memory cell 11 and timer, and control module 1 is connected with bus monitoring module 2 and branch monitoring module 3 and carries out insulation monitoring to bus and branch respectively, wherein:
as shown in fig. 3, the bus monitoring module 2 includes a voltage measuring unit 21, a calculation and analysis unit 22, and a monitoring bridge unit 23, where the voltage measuring unit 21 is configured to measure real-time voltages of a bus positive electrode and a bus negative electrode, the monitoring bridge unit 23 is configured to detect an insulation resistance value between the bus positive electrode and the bus negative electrode, both the voltage measuring unit 21 and the monitoring bridge unit 23 are connected to the calculation and analysis unit 22, the calculation and analysis unit 22 is connected to the storage unit 11, and the calculation and analysis unit 22 is configured to calculate a voltage difference, a current value, and an insulation resistance value between the bus positive electrode and the bus negative electrode, and determine an insulation fault according to a change condition of.
As shown in fig. 3, the monitoring bridge unit 23 includes a current measuring unit 231, a determining unit 232, a delay circuit 233, a bridge circuit 234 and a potentiometer set 235, the current measuring unit 231 is connected to the bus positive electrode, the bus negative electrode and the determining unit 232, the current measuring unit 231 is used for measuring real-time currents of the bus positive electrode and the bus negative electrode, the determining unit 232 is connected to an input end of the delay circuit 233 and the calculation and analysis unit 22, an output end of the delay circuit 233 is connected to the bridge circuit 234, the delay circuit 233 is used for increasing or decreasing a current rate, the bridge circuit 234 is connected to the potentiometer set 235 and a ground line, the bridge circuit 234 is used for measuring an insulation resistance value from the bus positive electrode to the ground or from the bus negative electrode to the ground by turning off a switch for multiple times, and the potentiometer.
As shown in fig. 3, the current measuring unit 231 includes a positive ammeter a + having one end connected to the positive electrode of the bus and the other end connected to the determining unit 232, and a negative ammeter a-having one end connected to the negative electrode of the bus and the other end connected to the determining unit 232. The voltage measuring unit 21 comprises a positive voltmeter V + and a negative voltmeter V-, one end of the positive voltmeter V + is connected with the positive electrode of the bus, the other end of the positive voltmeter V + is connected with the ground wire, one end of the negative voltmeter V-is connected with the negative electrode of the bus, and the other end of the negative voltmeter V-is connected with the ground wire.
As shown in fig. 3, the bridge circuit 234 includes a first resistor R1, a second resistor R2, a first switch K1, and a second switch K2, and the potentiometer group 235 includes a third potentiometer R3 and a fourth potentiometer R4, wherein: the resistance of the first resistor R1 is equal to the resistance of the second resistor R2, the first resistor R1, the third potentiometer R3 and the first switch K1 are connected in series, one end, far away from the first switch K1, of the first resistor R1 is connected with the output end of the delay circuit 233, one end, far away from the first resistor R1, of the first switch K1 is connected with the ground wire, the second resistor R2, the fourth potentiometer R4 and the second switch K2 are connected in series, one end, far away from the second switch K2, of the second resistor R2 is connected with the output end of the delay circuit 233, and one end, far away from the second resistor R2, of the second switch K2 is connected with the ground wire.
As shown in fig. 2, the branch line monitoring module 3 is connected to a branch line unit 31 and a communication unit 32, the branch line unit 31 is connected to a bus positive electrode, a bus negative electrode and a ground line, the branch line unit 31 includes a rectifier, a storage battery, a communication device and a bus insulating terminal, and the branch line monitoring module 3 is configured to monitor an insulation condition of the branch line unit 31 and transmit monitoring data through the communication unit 32. The branch line monitoring module 3 comprises a plurality of leakage current sensors 33, a plurality of GPS chips 34, a power amplifier 35 and an A/D conversion circuit 36, wherein the leakage current sensors 33 are arranged on the outer side of the connection line of each device in the branch line unit 31 and the bus, the GPS chips 34 are embedded in the leakage current sensors 33, the GPS chips 34 are used for positioning the positions of the devices with insulation faults, the leakage current sensors 33 are connected with the power amplifier 35, the power amplifier 35 is connected with the A/D conversion circuit 36, and the A/D conversion circuit 36 is connected with the control module 1.
As shown in fig. 1 to 3, based on the above-mentioned high-voltage direct-current insulation monitoring system, the present application also provides a monitoring method using the above-mentioned high-voltage direct-current insulation monitoring system, which includes the following steps:
s1, a control module 1 measures the voltage to ground of a bus anode and the voltage to ground of a bus cathode respectively through a timer at equal intervals and controlling a positive voltmeter V + and a negative voltmeter V-, and transmits the measured voltages to a calculation and analysis unit 22;
s2, calculating the voltage difference between the voltage to ground of the positive electrode of the bus and the voltage to ground of the negative electrode of the bus by the calculation and analysis unit 22, and recording and drawing change curves of the voltage to ground of the positive electrode of the bus and the voltage to ground of the negative electrode of the bus by the calculation and analysis unit 22;
s3, if the change curve is gentle, the control module 1 conducts insulation fault troubleshooting on each device of the branch line unit 31 through the branch line monitoring module 3, the plurality of leakage current sensors 33 conduct insulation fault detection on each device of the branch line unit 31 at the same time, detection data are amplified through the power amplifier 35, then digital-to-analog conversion is conducted through the A/D conversion circuit 36, then the detection data are uploaded to the control module 1, and the branch line unit 31 devices with insulation faults send position information through the GPS chip 34;
s4, detecting the grounding conditions of the positive electrode and the negative electrode of the bus through the bus monitoring module 2 when the change curve is instantaneously steep, closing the first switch K1 and the second switch K2, and primarily judging the insulation fault type and determining the delay time of the delay circuit 233 according to the measurement data and the interval time of the current measurement unit 231 and the voltage measurement unit 21 by the judgment unit 232; if the voltage difference transient state is too large, the current is increased, the delay time is increased, and at the moment, the bus is grounded in a single pole; if the voltage difference is smaller, the current difference is smaller but the current value is increased, and the bus bipolar is grounded at the moment; the control module 1 controls the third potentiometer R3 and the fourth potentiometer R4 to be zero, the bridge circuit 234 is a balanced bridge, and a first ratio of the voltage to ground of the positive pole of the bus to the voltage to ground of the negative pole of the bus is calculated; the control module 1 increases the resistance of the third potentiometer R3, the resistance of the fourth potentiometer R4 is still zero, the bridge circuit 234 is an unbalanced bridge, a second ratio of the bus positive electrode voltage to ground and the bus negative electrode voltage to ground is calculated, the control module 1 increases the resistance of the fourth potentiometer R4, the resistance of the third potentiometer R3 is adjusted to be zero, a third ratio of the bus positive electrode voltage to ground and the bus negative electrode voltage to ground is calculated, the second ratio and the third ratio are combined to calculate a bus positive electrode ground insulation resistance R + and a bus negative electrode ground insulation resistance R-, and the calculated values are transmitted to the calculation and analysis unit 22 to judge the grounding condition.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The high-voltage direct-current insulation monitoring system comprises a control module, and is characterized in that: the control module includes the memory cell, the control module is connected with bus monitoring module and branch monitoring module and carries out insulation monitoring to bus and branch respectively, wherein:
the bus monitoring module comprises a voltage measuring unit, a calculation and analysis unit and a monitoring bridge unit, wherein the voltage measuring unit is used for measuring real-time voltages of a bus anode and a bus cathode, the monitoring bridge unit is used for detecting an insulation resistance value between the bus anode and the bus cathode, the voltage measuring unit and the monitoring bridge unit are both connected with the calculation and analysis unit, the calculation and analysis unit is connected with a storage unit, the calculation and analysis unit is used for calculating a voltage difference, a current value and an insulation resistance value between the bus anode and the bus cathode, and judging an insulation fault according to the change conditions of the voltage difference and the insulation resistance value;
the branch line monitoring module is connected with a branch line unit and a communication unit, the branch line unit is connected with a bus positive electrode, a bus negative electrode and a grounding wire, the branch line unit comprises a rectifier, a storage battery, communication equipment and a bus insulating terminal, and the branch line monitoring module is used for monitoring the insulating condition of the branch line unit and transmitting monitoring data through the communication unit.
2. The high voltage direct current insulation monitoring system of claim 1, characterized in that: the monitoring bridge unit comprises a current measuring unit, a judging unit, a delay circuit, a bridge circuit and a potentiometer group, wherein the current measuring unit is connected with a bus anode, a bus cathode and the judging unit, the current measuring unit is used for measuring real-time current of the bus anode and the bus cathode, the judging unit is connected with a delay circuit input end and a calculation and analysis unit, the delay circuit output end is connected with the bridge circuit, the delay circuit is used for prolonging the increasing or reducing speed of current, the bridge circuit is connected with the potentiometer group and a grounding wire, the bridge circuit is used for measuring the insulation resistance value of the bus anode to the ground or the bus cathode to the ground through a plurality of turn-off switches, and the potentiometer group is connected with a control module.
3. The high voltage direct current insulation monitoring system of claim 2, characterized in that: the current measuring unit comprises a positive ammeter and a negative ammeter, wherein one end of the positive ammeter is connected with the positive electrode of the bus, the other end of the positive ammeter is connected with the judging unit, one end of the negative ammeter is connected with the negative electrode of the bus, and the other end of the negative ammeter is connected with the judging unit.
4. The high voltage direct current insulation monitoring system of claim 3, characterized in that: the bridge circuit includes first resistance, second resistance, first switch and second switch, the potentiometre group includes third potentiometre and fourth potentiometre, wherein: first resistance, third potentiometre and first switch series connection, first resistance is kept away from first switch one end and is connected the delay circuit output, first switch is kept away from first resistance one end and is connected the earth connection, second resistance, fourth potentiometre and second switch series connection, second switch one end is kept away from to the second resistance and is connected the delay circuit output, the second switch is kept away from second resistance one end and is connected the earth connection.
5. The high voltage direct current insulation monitoring system of claim 4, characterized in that: the resistance value of the first resistor is equal to the resistance value of the second resistor.
6. The high voltage direct current insulation monitoring system of claim 5, characterized in that: the voltage measurement unit comprises a positive voltage meter and a negative voltage meter, wherein one end of the positive voltage meter is connected with the positive electrode of the bus, the other end of the positive voltage meter is connected with the grounding wire, and one end of the negative voltage meter is connected with the negative electrode of the bus, and the other end of the negative voltage meter is connected with the grounding wire.
7. The high voltage direct current insulation monitoring system of claim 6, characterized in that: the branch line monitoring module comprises a plurality of leakage current sensors, a plurality of GPS chips, a power amplifier and an A/D conversion circuit, the leakage current sensors are arranged on the outer sides of connecting lines of each device and a bus in the branch line unit, the GPS chips are embedded in the leakage current sensors, the GPS chips are used for positioning the positions of the devices with insulation faults, the leakage current sensors are connected with the power amplifier, the power amplifier is connected with the A/D conversion circuit, and the A/D conversion circuit is connected with the control module.
8. The high voltage direct current insulation monitoring system of claim 7, characterized in that: a timer is arranged in the control module.
9. A monitoring method using the high voltage direct current insulation monitoring system of claim 8, characterized by: the method comprises the following steps:
s1, the control module respectively measures the voltage to ground of a bus anode and the voltage to ground of a bus cathode through a timer at equal intervals and controls a positive voltage meter and a negative voltage meter, and transmits the voltages to a calculation analysis unit;
s2, the calculation and analysis unit calculates the voltage difference between the voltage to ground of the positive electrode of the bus and the voltage to ground of the negative electrode of the bus, and the calculation and analysis unit records and draws the change curves of the voltage to ground of the positive electrode of the bus and the voltage to ground of the negative electrode of the bus;
s3, when the change curve is gentle, the control module conducts insulation fault troubleshooting on all devices of the branch line unit through the branch line monitoring module, the plurality of leakage current sensors conduct insulation fault detection on all the devices of the branch line unit at the same time, detection data are amplified through the power amplifier, then digital-to-analog conversion is conducted through the A/D conversion circuit, then the detection data are uploaded to the control module, and the branch line unit devices with insulation faults send position information through the GPS chip;
s4, detecting the grounding conditions of the positive electrode and the negative electrode of the bus through the bus monitoring module when the change curve is instantaneously steep, closing the first switch and the second switch, controlling the third potentiometer and the fourth potentiometer to be zero through the control module, and calculating a first ratio of the voltage to ground of the positive electrode of the bus to the voltage to ground of the negative electrode of the bus by using a bridge circuit as a balanced bridge; the control module increases the resistance of the third potentiometer, the resistance of the fourth potentiometer is still zero, the bridge circuit is an unbalanced bridge, a second ratio of the voltage to earth of the positive pole of the bus and the voltage to earth of the negative pole of the bus is calculated, the control module increases the resistance of the fourth potentiometer, the resistance of the third potentiometer is adjusted to be zero, a third ratio of the voltage to earth of the positive pole of the bus and the voltage to earth of the negative pole of the bus is calculated, the second ratio and the third ratio are combined to calculate the insulation resistance to earth of the positive pole of the bus and the insulation resistance to earth of the negative pole of the bus, and the calculated value is transmitted to the calculation and analysis unit to judge the grounding condition.
10. The monitoring method of the high voltage direct current insulation monitoring system according to claim 9, characterized in that: in step S4, after the first switch and the second switch are closed, the determining unit is configured to preliminarily determine the type of the insulation fault and determine the delay time of the delay circuit according to the measurement data and the interval time of the current measuring unit and the voltage measuring unit, and if the voltage difference is small and the current is small, reduce the delay time to a minimum value, and at this time, the insulation state is good; if the voltage difference transient state is too large, the current is increased, the delay time is increased, and at the moment, the bus is grounded in a single pole; if the voltage difference is small, the current difference is small but the current value is increased, and the bus bipolar is grounded.
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| CN114325228A (en) * | 2021-12-23 | 2022-04-12 | 蜂巢能源科技股份有限公司 | Method, system and storage medium for locating insulation fault point of energy storage system |
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